We arrive from London with BA into Chennai and transit to Colombo.
We only have hand luggage.
How long do we need for the connection and do we need a transit visa?
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Immigration could take around 30 minutes. Your flights are both international and should be in the same terminal. The gate will close around 45 minutes before departure.
From this website:
If you meet all of the following conditions, you can transit through India without visa. The conditions are:
Layover time is less than 24 hours as determined by scheduled arrival and departure times;
With confirmed plane tickets to a third country;
Staying in the specific Transit Area (means no clearing immigration, no re-checking your luggage).